193 lines
6.8 KiB
HTML
193 lines
6.8 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="sqlite.css" rel="stylesheet">
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<title>Version Numbers in SQLite</title>
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<!-- path= -->
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</head>
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<body>
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<div class=nosearch>
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<a href="index.html">
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<img class="logo" src="images/sqlite370_banner.gif" alt="SQLite" border="0">
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</a>
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<div><!-- IE hack to prevent disappearing logo --></div>
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<div class="tagline desktoponly">
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Small. Fast. Reliable.<br>Choose any three.
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</div>
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<div class="menu mainmenu">
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<ul>
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<li><a href="index.html">Home</a>
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<li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a>
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<li class='wideonly'><a href='about.html'>About</a>
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<li class='desktoponly'><a href="docs.html">Documentation</a>
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<li class='desktoponly'><a href="download.html">Download</a>
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<a href="javascript:void(0)" onclick='toggle_search()'>Search</a>
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</ul>
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<ul>
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<li><a href='about.html'>About</a>
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<li><a href='docs.html'>Documentation</a>
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<li><a href='download.html'>Download</a>
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<li><a href='support.html'>Support</a>
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<li><a href='prosupport.html'>Purchase</a>
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</ul>
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<div class="searchmenu" id="searchmenu">
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<form method="GET" action="search">
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<select name="s" id="searchtype">
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<option value="d">Search Documentation</option>
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<option value="c">Search Changelog</option>
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</select>
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<input type="submit" value="Go">
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</form>
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window.onbeforeunload = function(e){div_off("submenu");}
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</div>
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<div class=fancy>
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<div class=nosearch>
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<div class="fancy_title">
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Version Numbers in SQLite
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</div>
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</div>
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<h1 id="sqlite_version_numbers"><span>1. </span>SQLite Version Numbers</h1>
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<p>
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Beginning with <a href="releaselog/3_9_0.html">version 3.9.0</a> (2015-10-14) SQLite uses
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<a href="http://semver.org">semantic versioning</a>.
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Prior to that time, SQLite employed a version identifier that
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contained between two and four numbers.
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</p><h2 id="the_new_version_numbering_system_after_dateof_3_9_0_"><span>1.1. </span>The New Version Numbering System (After 2015-10-14)</h2>
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<p>
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All SQLite releases starting with 3.9.0 use a three-number
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"<a href="http://semver.org">semantic version</a>" of the form X.Y.Z.
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The first number X is only increased when there is a change that
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breaks backward compatibility. The
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current value for X is 3, and the SQLite developers plan to support
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the current SQLite database file format, SQL syntax, and C interface
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through <a href="lts.html">at least the year 2050</a>. Hence, one
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can expect that all future versions of SQLite for the next several
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decades will begin with "3.".
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</p><p>
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The second number Y is incremented for any change that breaks forward
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compatibility by adding new features.
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Most future SQLite releases are expected
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to increment the second number Y. The Z is reset to zero whenever Y
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is increased.
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</p><p>
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The third number Z is incremented for releases consisting of only
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small changes that implement performance enhancements and/or bug fixes.
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</p><p>
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The rate of enhancement for SQLite over the previous five years
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(2010-2015) is approximately 6 increments of Y per year. The
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numbering format used by for <a href="c3ref/c_source_id.html">SQLITE_VERSION_NUMBER</a> and
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<a href="c3ref/libversion.html">sqlite3_libversion_number()</a> allows versions up to 3.999.999, which is
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more than enough for the planned end-of-support date for SQLite
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in 2050. However, the current tarball naming conventions only
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reserve two digits for the Y and so the naming format for downloads
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will need to be revised in about 2030.
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</p><h2 id="the_historical_numbering_system_before_dateof_3_9_0_"><span>1.2. </span>The Historical Numbering System (Before 2015-10-14)</h2>
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<p>This historical version numbering system used a two-, three-,
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or four-number version: W.X, W.X.Y, or W.X.Y.Z.
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W was the file format: 1 or 2 or 3.
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X was the major version.
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Y was the minor version.
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Z was used only for patch releases to fix bugs.
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</p><p>
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There have been three historical file formats for SQLite.
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SQLite 1.0 through 1.0.32 used the
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<a href="https://www.gnu.org/software/gdbm/gdbm.html">gdbm</a> library as its storage
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engine.
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SQLite 2.0.0 through 2.8.17 used a custom b-tree storage engine that
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supported only text keys and data.
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All modern versions of SQLite (3.0.0 to present) use a b-tree storage
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engine that has full support for binary data and Unicode.
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</p><p>
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This major version number X was historically incremented only for
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large and important changes to the code. What constituted "large
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and important" was subjective. The 3.6.23 to 3.7.0 change
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was a result of adding support for <a href="wal.html">WAL mode</a>.
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The 3.7.17 to 3.8.0 change was a result of rewrite known as the
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<a href="queryplanner-ng.html">next generation query planner</a>.
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</p><p>
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The minor version number Y was historically incremented for new
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features and/or new interfaces that did not significantly change
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the structure of the code. The addition of <a href="lang_with.html">common table expressions</a>,
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<a href="partialindex.html">partial indexes</a>, and <a href="expridx.html">indexes on expressions</a> are all examples of
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"minor" changes. Again, the distinction between "major" and "minor"
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is subjective.
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</p><p>
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The patch level Z was historically only used for bug-fix releases
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that changed only a small number of code lines.
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</p><h2 id="version_history"><span>1.3. </span>Version History</h2>
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<ul>
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<li><a href="chronology.html">Chronology</a>
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</li><li><a href="changes.html">Change log</a>
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</li></ul>
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